Improvement in door-springs



F.4 s.- WILLCCX, o-'F- VBRIDGEPCRT, CONNECTICUT.v

Letters Patent No. 86,482, dated February 2, 1869.

IIVIPRYOVEMENT IN DOOR-SPRINGS.

The Schedule referred to in these LettersAPatent and making part of the lama..

To all whom it concern.-

y Beit known that I, F. S. WILLCOX, ot' Bridgeport, in the county of Fairfield, and State of Connecticut, have invented a new Improvement in Door-Spring; and I do hereby declare the following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in Y Figure l, a front view of the spring as attached to the door, and-in Figure 2, a top View, showing the door open,in red.

This invention relates to an improvement in springs for closing doors; and consists inthe arrangement of a rod, upon which aspiral spring is placed, one end of the said rod restinginva seat on the door, the other, in an arm pivoted to an arm which extends from the jamb, so that' While the opening ofthe door contracts the spring less than it would were it not attached to the pivoted arm, such attachment increases the force of the spring as the door closes.

In order to the clear understanding of myf invention, I will fully describe the same as illustrated in the accompanying drawings.

A is the door(A B, the jamb.

0,21- metallic rod, upon which is placed a spiral A the arm will swing around to the position denoted in` red, tig. 2r; therefore the arm F attached to .the door, will, when the door is open, passing upon the line d, come to the position denoted in red.

The rod C turning, `with the arm H, upon the pivot a, passes through the arm F, and upon the line j, to

the position denoted in red.

Itwill be noticed that were the-rod() pivoted into the arm H, and the arm H rigid, that is, one piecewith the -arm I, the rod 0 would have turned in the line h, and thus have contracted the spring to a distance equal to the distance between the lines h and d,

and yet the force of the springwould have been no` greater in closing, as it arrived toward the closed -position, and the force of the spring to close the doorwhen in the position denoted in red, would have been nothing, but, on the contrary, would serveV to hold open the door, whereas, by pivoting-the armll -the bearing of' the rod is carried back' as the door opens, so that the 'spring is compressed onlyT by so much as Athe* difference between the lines f and d, andby beingl so carlied back in that position, exeltsa force to close the door, which force increases until the door is entirely` closed.

Having thus fully described my invention,

What I claim as new and useful, and desire to secure by Letters Patent, is-

The combination of the rod C, jointed arm H I, spring D, and arm F, all arranged and operating in the manner described.

- F. S. WILLGOX.

Witnesses:

ALONZO. ScRAN'roN, Oms. K. Winmx. 

